1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
3 Copyright © 2013 Intel Corporation
5 Nathaniel Chen <nathaniel.chen@intel.com>
14 #include "alloc-util.h"
15 #include "dirent-util.h"
20 #include "smack-setup.h"
21 #include "string-util.h"
25 static int fdopen_unlocked_at(int dfd
, const char *dir
, const char *name
, int *status
, FILE **ret_file
) {
29 fd
= openat(dfd
, name
, O_RDONLY
|O_CLOEXEC
);
34 return log_warning_errno(errno
, "Failed to open \"%s/%s\": %m", dir
, name
);
37 r
= fdopen_unlocked(fd
, "r", &f
);
43 return log_error_errno(r
, "Failed to open \"%s/%s\": %m", dir
, name
);
50 static int write_access2_rules(const char *srcdir
) {
51 _cleanup_close_
int load2_fd
= -EBADF
, change_fd
= -EBADF
;
52 _cleanup_closedir_
DIR *dir
= NULL
;
53 int dfd
= -EBADF
, r
= 0;
55 load2_fd
= open("/sys/fs/smackfs/load2", O_RDWR
|O_CLOEXEC
|O_NONBLOCK
|O_NOCTTY
);
58 log_warning_errno(errno
, "Failed to open '/sys/fs/smackfs/load2': %m");
59 return -errno
; /* negative error */
62 change_fd
= open("/sys/fs/smackfs/change-rule", O_RDWR
|O_CLOEXEC
|O_NONBLOCK
|O_NOCTTY
);
65 log_warning_errno(errno
, "Failed to open '/sys/fs/smackfs/change-rule': %m");
66 return -errno
; /* negative error */
69 /* write rules to load2 or change-rule from every file in the directory */
70 dir
= opendir(srcdir
);
73 log_warning_errno(errno
, "Failed to opendir '%s': %m", srcdir
);
74 return errno
; /* positive on purpose */
80 FOREACH_DIRENT(entry
, dir
, return 0) {
81 _cleanup_fclose_
FILE *policy
= NULL
;
83 if (!dirent_is_file(entry
))
86 if (fdopen_unlocked_at(dfd
, srcdir
, entry
->d_name
, &r
, &policy
) < 0)
89 /* load2 write rules in the kernel require a line buffered stream */
91 _cleanup_free_
char *buf
= NULL
, *sbj
= NULL
, *obj
= NULL
, *acc1
= NULL
, *acc2
= NULL
;
94 q
= read_line(policy
, NAME_MAX
, &buf
);
96 return log_error_errno(q
, "Failed to read line from '%s': %m", entry
->d_name
);
100 if (isempty(buf
) || strchr(COMMENTS
, buf
[0]))
103 /* if 3 args -> load rule : subject object access1 */
104 /* if 4 args -> change rule : subject object access1 access2 */
105 if (sscanf(buf
, "%ms %ms %ms %ms", &sbj
, &obj
, &acc1
, &acc2
) < 3) {
106 log_error_errno(errno
, "Failed to parse rule '%s' in '%s', ignoring.", buf
, entry
->d_name
);
110 if (write(isempty(acc2
) ? load2_fd
: change_fd
, buf
, strlen(buf
)) < 0) {
113 log_error_errno(errno
, "Failed to write '%s' to '%s' in '%s': %m",
114 buf
, isempty(acc2
) ? "/sys/fs/smackfs/load2" : "/sys/fs/smackfs/change-rule", entry
->d_name
);
122 static int write_cipso2_rules(const char *srcdir
) {
123 _cleanup_close_
int cipso2_fd
= -EBADF
;
124 _cleanup_closedir_
DIR *dir
= NULL
;
125 int dfd
= -EBADF
, r
= 0;
127 cipso2_fd
= open("/sys/fs/smackfs/cipso2", O_RDWR
|O_CLOEXEC
|O_NONBLOCK
|O_NOCTTY
);
130 log_warning_errno(errno
, "Failed to open '/sys/fs/smackfs/cipso2': %m");
131 return -errno
; /* negative error */
134 /* write rules to cipso2 from every file in the directory */
135 dir
= opendir(srcdir
);
138 log_warning_errno(errno
, "Failed to opendir '%s': %m", srcdir
);
139 return errno
; /* positive on purpose */
145 FOREACH_DIRENT(entry
, dir
, return 0) {
146 _cleanup_fclose_
FILE *policy
= NULL
;
148 if (!dirent_is_file(entry
))
151 if (fdopen_unlocked_at(dfd
, srcdir
, entry
->d_name
, &r
, &policy
) < 0)
154 /* cipso2 write rules in the kernel require a line buffered stream */
156 _cleanup_free_
char *buf
= NULL
;
159 q
= read_line(policy
, NAME_MAX
, &buf
);
161 return log_error_errno(q
, "Failed to read line from '%s': %m", entry
->d_name
);
165 if (isempty(buf
) || strchr(COMMENTS
, buf
[0]))
168 if (write(cipso2_fd
, buf
, strlen(buf
)) < 0) {
171 log_error_errno(errno
, "Failed to write '%s' to '/sys/fs/smackfs/cipso2' in '%s': %m",
181 static int write_netlabel_rules(const char *srcdir
) {
182 _cleanup_fclose_
FILE *dst
= NULL
;
183 _cleanup_closedir_
DIR *dir
= NULL
;
184 int dfd
= -EBADF
, r
= 0;
186 dst
= fopen("/sys/fs/smackfs/netlabel", "we");
189 log_warning_errno(errno
, "Failed to open /sys/fs/smackfs/netlabel: %m");
190 return -errno
; /* negative error */
193 /* write rules to dst from every file in the directory */
194 dir
= opendir(srcdir
);
197 log_warning_errno(errno
, "Failed to opendir %s: %m", srcdir
);
198 return errno
; /* positive on purpose */
204 FOREACH_DIRENT(entry
, dir
, return 0) {
205 _cleanup_fclose_
FILE *policy
= NULL
;
207 if (fdopen_unlocked_at(dfd
, srcdir
, entry
->d_name
, &r
, &policy
) < 0)
210 /* load2 write rules in the kernel require a line buffered stream */
212 _cleanup_free_
char *buf
= NULL
;
215 q
= read_line(policy
, NAME_MAX
, &buf
);
217 return log_error_errno(q
, "Failed to read line from %s: %m", entry
->d_name
);
221 if (!fputs(buf
, dst
)) {
224 log_error_errno(errno
, "Failed to write line to /sys/fs/smackfs/netlabel: %m");
227 q
= fflush_and_check(dst
);
231 log_error_errno(q
, "Failed to flush writes to /sys/fs/smackfs/netlabel: %m");
240 static int write_onlycap_list(void) {
241 _cleanup_close_
int onlycap_fd
= -EBADF
;
242 _cleanup_free_
char *list
= NULL
;
243 _cleanup_fclose_
FILE *f
= NULL
;
247 f
= fopen("/etc/smack/onlycap", "re");
250 log_warning_errno(errno
, "Failed to read '/etc/smack/onlycap': %m");
252 return errno
== ENOENT
? ENOENT
: -errno
;
256 _cleanup_free_
char *buf
= NULL
;
259 r
= read_line(f
, LONG_LINE_MAX
, &buf
);
261 return log_error_errno(r
, "Failed to read line from /etc/smack/onlycap: %m");
265 if (isempty(buf
) || strchr(COMMENTS
, *buf
))
269 if (!GREEDY_REALLOC(list
, len
+ l
+ 1))
272 stpcpy(list
+ len
, buf
)[0] = ' ';
281 onlycap_fd
= open("/sys/fs/smackfs/onlycap", O_WRONLY
|O_CLOEXEC
|O_NONBLOCK
|O_NOCTTY
);
282 if (onlycap_fd
< 0) {
284 log_warning_errno(errno
, "Failed to open '/sys/fs/smackfs/onlycap': %m");
285 return -errno
; /* negative error */
288 r
= write(onlycap_fd
, list
, len
);
290 return log_error_errno(errno
, "Failed to write onlycap list(%s) to '/sys/fs/smackfs/onlycap': %m", list
);
297 int mac_smack_setup(bool *loaded_policy
) {
303 assert(loaded_policy
);
305 r
= write_access2_rules("/etc/smack/accesses.d/");
308 log_debug("Smack is not enabled in the kernel.");
311 log_debug("Smack access rules directory '/etc/smack/accesses.d/' not found");
314 log_info("Successfully loaded Smack policies.");
317 log_warning_errno(r
, "Failed to load Smack access rules, ignoring: %m");
321 #if HAVE_SMACK_RUN_LABEL
322 r
= write_string_file("/proc/self/attr/current", SMACK_RUN_LABEL
, WRITE_STRING_FILE_DISABLE_BUFFER
);
324 log_warning_errno(r
, "Failed to set SMACK label \"" SMACK_RUN_LABEL
"\" on self: %m");
325 r
= write_string_file("/sys/fs/smackfs/ambient", SMACK_RUN_LABEL
, WRITE_STRING_FILE_DISABLE_BUFFER
);
327 log_warning_errno(r
, "Failed to set SMACK ambient label \"" SMACK_RUN_LABEL
"\": %m");
328 r
= write_string_file("/sys/fs/smackfs/netlabel",
329 "0.0.0.0/0 " SMACK_RUN_LABEL
, WRITE_STRING_FILE_DISABLE_BUFFER
);
331 log_warning_errno(r
, "Failed to set SMACK netlabel rule \"0.0.0.0/0 " SMACK_RUN_LABEL
"\": %m");
332 r
= write_string_file("/sys/fs/smackfs/netlabel", "127.0.0.1 -CIPSO", WRITE_STRING_FILE_DISABLE_BUFFER
);
334 log_warning_errno(r
, "Failed to set SMACK netlabel rule \"127.0.0.1 -CIPSO\": %m");
337 r
= write_cipso2_rules("/etc/smack/cipso.d/");
340 log_debug("Smack/CIPSO is not enabled in the kernel.");
343 log_debug("Smack/CIPSO access rules directory '/etc/smack/cipso.d/' not found");
346 log_info("Successfully loaded Smack/CIPSO policies.");
349 log_warning_errno(r
, "Failed to load Smack/CIPSO access rules, ignoring: %m");
353 r
= write_netlabel_rules("/etc/smack/netlabel.d/");
356 log_debug("Smack/CIPSO is not enabled in the kernel.");
359 log_debug("Smack network host rules directory '/etc/smack/netlabel.d/' not found");
362 log_info("Successfully loaded Smack network host rules.");
365 log_warning_errno(r
, "Failed to load Smack network host rules: %m, ignoring.");
369 r
= write_onlycap_list();
372 log_debug("Smack is not enabled in the kernel.");
375 log_debug("Smack onlycap list file '/etc/smack/onlycap' not found");
378 log_info("Successfully wrote Smack onlycap list.");
381 return log_emergency_errno(r
, "Failed to write Smack onlycap list: %m");
384 *loaded_policy
= true;